Code 0420 come up

Asked by Jul 28, 2010 at 09:37 PM about the 2006 Lincoln Navigator

Question type: Maintenance & Repair

I Have a 2006 Lincoln Nav the cataylic converter been replaced twice. When I had 60,000 and 112,000. Don;t know why 0420 code keep coming up.
    

1 Answer

have you changed your oxygen scensors,or the muffler,you know they can stop up to and through out a code.

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